Signal compressing apparatus

Abstract

An input signal is quantized into a quantization-resultant signal. The quantization-resultant signal is compressed into a compression-resultant signal. The compression-resultant signal is formatted into a formatting-resultant signal corresponding to a predetermined format for a digital recording disc. The formatting-resultant signal includes segments corresponding to user data areas prescribed in the predetermined format. The compression-resultant signal is placed in the segments of the formatting-resultant signal. The formatting-resultant signal is encoded into an encoding-resultant signal of a CD format. The encoding-resultant signal is recorded on a recording medium.

1. A signal expanding method comprising the steps of:
 receiving an encoding-resultant signal of a predetermined recording-medium format from a DVD, the encoding-resultant signal containing audio information resulting from quantization of an audio signal including a multi-channel audio signal at a quantization degree higher than a degree of quantization for a CD and at a quantization sampling frequency higher than that for a CD; 
 decoding the received encoding-resultant signal into a formatting-resultant signal corresponding to a predetermined format for a DVD, the formatting-resultant signal including segments corresponding to user data areas prescribed in the predetermined format, a compression-resultant signal being placed in the segments of formatting-resultant signal; 
 deformatting the formatting-resultant signal into the compression-resultant signal; and 
 expanding the compression-resultant signal into a quantization-resultant signal by a Huffman decoding process. 
 
   
   
     2. A signal expanding method comprising the steps of:
 receiving an encoding-resultant signal of a predetermined recording-medium format from a DVD, the encoding-resultant signal containing audio information resulting from quantization of an audio signal including a multi-channel audio signal at a quantization degree higher than a degree of quantization for a CD and at a quantization sampling frequency higher than that for a CD; 
 decoding the received encoding-resultant signal into a formatting-resultant signal corresponding to a predetermined format for a DVD, the formatting-resultant signal including segments corresponding to user data areas prescribed in the predetermined format, a compression-resultant signal being placed in the segments of formatting-resultant signal; 
 deformatting the formatting-resultant signal into the compression-resultant signal; and 
 expanding the compression-resultant signal into a quantization-resultant signal by one of an orthogonal decoding process and a Huffman decoding process. 
 
   
   
     3. A computer readable medium encoded with instruction capable of being executed by a computer for storing an encoding-resultant signal containing audio information which is recording on the recording medium by the steps of quantizing an input audio signal including a multi-channel audio signal into a quantization-resultant signal at a quantization degree higher than a degree of quantization for a CD and at a quantization sampling frequency higher than that for a CD;
 compressing the quantizing-resultant signal into a compression signal by a Huffman encoding process; 
 formatting the compression-resultant signal into a formatting-resultant signal corresponding to a predetermined format for a DVD, the formatting-resultant signal including segments corresponding to user data areas prescribed in the predetermined format, the compression-resultant signal being placed in the segments of the formatting-resultant signal; 
 encoding the formatting-resultant signal into an encoding-resultant signal of a predetermined recording-medium format; and 
 recording the encoding-resultant signal on the recording medium. 
 
   
   
     4. A signal recording method for recording a recording medium as recited in  claim 3 , wherein the method comprises the steps of quantizing an input audio signal including a multi-channel audio signal into a quantization-resultant signal at a quantization degree higher than a degree of quantization for a CD and at a quantization sampling frequency higher than that for a CD;
 compressing the quantization-resultant signal into a compression signal by a Huffman encoding process; 
 formatting the compression-resultant signal into a formatting-resultant signal corresponding to a predetermined format for a DVD, the formatting-resultant signal including segments corresponding to user data areas prescribed in the predetermined format, the compression-resultant signal being placed in the segments of the formatting-resultant signal; 
 encoding the formatting-resultant signal into an encoding-resultant signal of a predetermined recording-medium format; and 
 recording the encoding-resultant signal on the recording medium. 
 
   
   
     5. An apparatus for an optical disc, comprising:
 a CD-DA decoder; 
 a DVD decoder; 
 a DVD-audio expansion decoder including Huffman decoding; 
 means for reading out a signal from the optical disc; 
 means for deciding which of a CD-DA, a DVD, and a DVD-audio the optical disc agrees with; 
 means for, when the optical disc agrees with a CD-DA, selecting the CD-DA decoder from among the CD-DA decoder, the DVD decoder, and the expansion decoder and using the CD-DA decoder to process the signal read out from the optical disc into a recovery signal; 
 means for, when the optical disc agrees with a DVD, selecting the DVD decoder from among the CD-DA decoder, the DVD decoder, and the expansion decoder and using the DVD decoder to process the signal read out from the optical disc into a recovery signal; and 
 means for, when the optical disc agrees with a DVD-audio, selecting the expansion decoder to process the signal read out from the optical disc into a recovery signal.